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- Title
Relative infaunal bivalve density assessed from split beam echosounder angular information.
- Authors
S'anchez-Carnero, Noela; Rodr'ıguez-P'erez, Daniel; Zaragoz'a, Nuria; Espinosa, Victor; Freire, Juan
- Abstract
Management of shellfish resources requires a spatial approach where mapping is a key tool. Acoustic techniques have been rarely used to map infaunal organisms with a patchy distribution. We propose and test the use of splitbeam echosounder angular information to assess razor shell presence and relative density. Our statistical approach combines textural analysis of angular echograms, standard unsupervised multivariate methods and hierarchical classification through dendrograms to identify groups of locations with similar clam densities. The statistical analyses show that the classification is consistent with groundtruthing data and that results are insensitive to boat motion or seabed granulometry. The method developed here constitutes a promising tool for assessing the relative density of razor clam grounds
- Subjects
PONTEVEDRA Estuary (Spain); SHELLFISH; FISHERY management; RAZOR clams; ULTRASONIC imaging; SPECIFIC gravity
- Publication
Oceanologia, 2014, Vol 56, Issue 3, p497
- ISSN
0078-3234
- Publication type
Article
- DOI
10.5697/oc.56-3.497